This function associates the specified instance of the Help Manager with the window chain of the specified application window.

#define INCL_WINHELP /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HWND    hwndHelpInstance;  /*  Handle of an instance of the Help Manager. */
HWND    hwndApp;           /*  Handle of an application window. */
BOOL    rc;                /*  Success indicator. */

rc = WinAssociateHelpInstance(hwndHelpInstance,
       hwndApp);